Litter tray frame



FIG. 1 is a side perspective view of my litter tray frame design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left elevation view thereof, which is a mirror image of the right elevation view;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a litter tray frame, substantially as shown and described. 